Gel batteries function via oxygen recombination. However, unlike flooded lead-acid batteries, which are filled with liquid that needs replenishing, gel batteries contain a solid electrolytic matrix – a gel of silica and sulfuric acid. This gel is created when colloidal silica particles form a network of siloxane bridges between themselves, to which sulfuric acid can then bind.
Thanks to its stable liquid dispersion, manufacturing gel batteries using colloidal silica is easier than with fumed silica. Colloidal silica is easily mixed with sulfuric acid with an in-line mixer and without the need for vacuum filling of the battery. Moreover, handling is easier and the working environment is improved because the dusting commonly associated with fumed silica is eliminated.
Depending on the customer’s specific manufacturing requirements, colloidal silica dosage can be varied. By controlling dosage and temperature, gelling time and gel strength can be optimized. Additionally, colloidal silica is an excellent acid viscosity modifier for AGM batteries at low product dosage.
Particle Size (µm) |
pH |
Solids Content |
Density (g/cm3) |
Viscosity |
|
Levasil GB1000 |
15 nm |
10 |
30% |
1.2 |
< 8 |
Levasil GB2000 |
15 nm |
10 |
40% |
1.3 |
< 19 |
Levasil GB3000 |
7 nm |
10 |
15% |
1.1 |
< 10 |
Contact us for advice on how you can improve the efficiency of your application with Levasil Colloidal Silica.